Pentair Quartz Sleeve 50.75" | BioShield UV System | 523041 Pool Liner Accessories inspect the skimmer throat and

inspect the skimmer throat and surrounding deck flange for any cracking or deformation — a damaged mounting surface can prevent the cover from seating flush and may allow debris to bypass the skimmer opening

Total For pools and spas that use bromine instead of chlorine

Inspect the weir each spring when reopening the pool

A damaged or cracked bottom manifold allows water to bypass the filter media entirely

Pentair Quartz Sleeve 50.75" | BioShield UV System | 523041 Pool Liner Accessories inspect the skimmer throat andThe Pentair Quartz Sleeve (523041) is the OEM replacement quartz sleeve for the Pentair BioShield UV System 120 Watt (Model 522637), measuring 50. 75 inches in length. The quartz sleeve surrounds the UV lamp inside the BioShield sterilizer, transmitting ultraviolet light into the water flow while isolating the lamp from direct water contact. A cracked, clouded, or mineral scaled sleeve reduces UV transmittance and compromises disinfection output.